PAID POST
human civilization has strted realizing how harm rhey already caused to the environment' not to menntion the costs involved; and when it comes to take a stand against these environmental problems' the focus shifts to the use of alternative energy sources. have you ever wondererd ehat alternative energy sources are ? and why are they supposed to help us sustain ? alternative sources of energy are the ones whish do not cause any undesirable consequences to the environment, are renewable and are free!